page_title: Gastrulation
hierarchical_section_title: Gastrulation
caption_attribution_description: English: A scheme of embryo gastrulation.
context_page_description: Gastrulation is a phase early in the development of most animal embryos. In it the embryo is dramatically restructured by cell migration.
  Gastrulation varies in different phyla. It is followed by organogenesis, when individual organs develop within the newly formed germ layers.
  The gastrula is the double-walled stage of the embryo. During gastrulation, some of the cells of the blastula migrate inwards to make an inner layer, the endoderm. In some animals another cell layer forms, the mesoderm, between the endoderm and the ectoderm.
context_section_description: Gastrulation is a phase early in the development of most animal embryos. In it the embryo is dramatically restructured by cell migration.
  Gastrulation varies in different phyla. It is followed by organogenesis, when individual organs develop within the newly formed germ layers.
  The gastrula is the double-walled stage of the embryo. During gastrulation, some of the cells of the blastula migrate inwards to make an inner layer, the endoderm. In some animals another cell layer forms, the mesoderm, between the endoderm and the ectoderm.
caption: Gastrulation of a diploblast: The formation of germ layers from a (1) sphere of cells (the blastula) to a (2) gastrula. Some of the ectoderm cells (orange) move inward forming the endoderm (red).
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